The invention provides an aromatic diamine monomer. The aromatic diamine monomer has a structure shown as formula (V), in the formula (V), R1 is selected from alkyl, substituted alkyl, phenyl or substituted phenyl; R2 and R3 are independently selected from hydroxyl or a group disclosed in the invention, and are different from each other; and R4 is selected from hydrogen or a group disclosed in theinvention. Compared with the prior art, the aromatic diamine monomer provided by the invention contains an o-hydroxyl benzophenone structural unit; the o-hydroxyl benzophenone structural unit can beintroduced into a polyimide macromolecular chain through copolymerization; when the material is exposed to an ultraviolet radiation environment, the o-hydroxyl benzophenone structure can absorb ultraviolet light and release the ultraviolet light in the form of heat to prevent or delay the damage of ultraviolet radiation to the polyimide material, so that the obtained polyimide material has excellent intrinsic ultraviolet radiation resistance.